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LM2601MTCX Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LM2601MTCX Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 6 page Typical Delay Time vs. Temperature 10130905 Application Information The adapter interface circuit (AIC) IC provides the control functions necessary for use in mating a constant voltage output AC-DC adapter or airline adapter to a notebook com- puter system or a portable device. It allows optimal battery charging during computer operation, and allows battery dis- charge for battery gas gauge calibration. It receives control signals from the notebook computer, monitors input current from the adapter, provides adapter voltage status to the notebook system management microcontroller (or ″embed- ded controller ″), and appropriately drives MOSFET switches to electrically connect the adapter to the computer. AIC will allow a system designer to solve various power management tasks typical for an adapter powered systems containing a rechargeable battery. When a notebook computer is being powered from a battery and the adapter is plugged in, the computer should start drawing power from the adapter, not from the battery. The most time efficient charging scenario is when a computer draws the full rated current from a constant voltage adapter. The computer uses what it needs to run, and passes all remaining power on to the battery for charging. The com- puter should be able to automatically refuse to charge a battery when powered from an airplane power line. It may be necessary sometimes to have a computer fully discharging the battery and then fully recharging it (for battery gas gauge calibration purposes) while being powered by an AC adapter. AIC will also allow a computer to prevent backfeeding cur- rent into an adapter if the adapter is not powered while being plugged into the computer (some of existing adapters can draw current from the computer under this conditions for charging the AC adapter output bulk capacitance from the computer battery). While the lowest usable adapter voltage is about 9.5V, that is V ADAPTER = 11.7V minus 2.2V hysteresis, AIC is operational down to V ADAPTER = 5V. This means that AIC will not gen- erate false readings down to V ADAPTER = 5V. Such false readings would be MPS = HIGH, ADAPTER PRESENT = HIGH, CHARGER PRESENT = HIGH. AIC determines usable voltage ranges by comparing V ADAPTER with an internal 2.5V voltage reference (see also Electrical Characteristics). AIC detects operating current limit and leakage current limit into the adapter jack by differential sensing across current sense resistor R SENSE either directly or scaled down by resistor dividers R1/R3 and R2/R4. When designing the LM2601 into a system it may be neces- sary to consider ESD protection requirements for the adapter jack according to your system design spec. www.national.com 5 |
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